/*
 * Copyright (c) 2012 David Siñuela Pastor, siu.4coders@gmail.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef __MINUNIT_H__
#define __MINUNIT_H__

#ifdef __cplusplus
    extern "C" {
#endif

#if defined(_WIN32)
#include <Windows.h>

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))

/* Change POSIX C SOURCE version for pure c99 compilers */
#if !defined(_POSIX_C_SOURCE) || _POSIX_C_SOURCE < 200112L
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112L
#endif

#include <unistd.h> /* POSIX flags */
#include <time.h>   /* clock_gettime(), time() */
#include <sys/time.h>   /* gethrtime(), gettimeofday() */
#include <sys/resource.h>
#include <sys/times.h>

#if defined(__MACH__) && defined(__APPLE__)
#include <mach/mach.h>
#include <mach/mach_time.h>
#endif

#else
#error "Unable to define timers for an unknown OS."
#endif

#include <stdio.h>
#include <math.h>

/*  Maximum length of last message */
#define MINUNIT_MESSAGE_LEN 1024
/*  Do not change */
#define MINUNIT_EPSILON 1E-12

/*  Misc. counters */
static int minunit_run = 0;
static int minunit_assert = 0;
static int minunit_fail = 0;
static int minunit_status = 0;

/*  Timers */
static double minunit_real_timer = 0;
static double minunit_proc_timer = 0;

/*  Last message */
static char minunit_last_message[MINUNIT_MESSAGE_LEN];

/*  Test setup and teardown function pointers */
static void (*minunit_setup)(void) = NULL;
static void (*minunit_teardown)(void) = NULL;

/*  Definitions */
#define MU_TEST(method_name) static void method_name()
#define MU_TEST_SUITE(suite_name) static void suite_name()

#define MU__SAFE_BLOCK(block) do {\
    block\
} while(0)

/*  Run test suite and unset setup and teardown functions */
#define MU_RUN_SUITE(suite_name) MU__SAFE_BLOCK(\
    suite_name();\
    minunit_setup = NULL;\
    minunit_teardown = NULL;\
)

/*  Configure setup and teardown functions */
#define MU_SUITE_CONFIGURE(setup_fun, teardown_fun) MU__SAFE_BLOCK(\
    minunit_setup = setup_fun;\
    minunit_teardown = teardown_fun;\
)

/*  Test runner */
#define MU_RUN_TEST(test) MU__SAFE_BLOCK(\
    if (minunit_real_timer==0 && minunit_real_timer==0) {\
        minunit_real_timer = mu_timer_real();\
        minunit_proc_timer = mu_timer_cpu();\
    }\
    if (minunit_setup) (*minunit_setup)();\
    minunit_status = 0;\
    test();\
    minunit_run++;\
    if (minunit_status) {\
        minunit_fail++;\
        printf("F");\
        printf("\n%s\n", minunit_last_message);\
    }\
    fflush(stdout);\
    if (minunit_teardown) (*minunit_teardown)();\
)

/*  Report */
#define MU_REPORT() MU__SAFE_BLOCK(\
    double minunit_end_real_timer;\
    double minunit_end_proc_timer;\
    printf("\n\n%d tests, %d assertions, %d failures\n", minunit_run, minunit_assert, minunit_fail);\
    minunit_end_real_timer = mu_timer_real();\
    minunit_end_proc_timer = mu_timer_cpu();\
    printf("\nFinished in %.8f seconds (real) %.8f seconds (proc)\n\n",\
        minunit_end_real_timer - minunit_real_timer,\
        minunit_end_proc_timer - minunit_proc_timer);\
)

/*  Assertions */
#define mu_check(test) MU__SAFE_BLOCK(\
    minunit_assert++;\
    if (!(test)) {\
        snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %s", __func__, __FILE__, __LINE__, #test);\
        minunit_status = 1;\
        return;\
    } else {\
        printf(".");\
    }\
)

#define mu_fail(message) MU__SAFE_BLOCK(\
    minunit_assert++;\
    snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %s", __func__, __FILE__, __LINE__, message);\
    minunit_status = 1;\
    return;\
)

#define mu_assert(test, message) MU__SAFE_BLOCK(\
    minunit_assert++;\
    if (!(test)) {\
        snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %s", __func__, __FILE__, __LINE__, message);\
        minunit_status = 1;\
        return;\
    } else {\
        printf(".");\
    }\
)

#define mu_assert_int_eq(expected, result) MU__SAFE_BLOCK(\
    int minunit_tmp_e;\
    int minunit_tmp_r;\
    minunit_assert++;\
    minunit_tmp_e = (expected);\
    minunit_tmp_r = (result);\
    if (minunit_tmp_e != minunit_tmp_r) {\
        snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %d expected but was %d", __func__, __FILE__, __LINE__, minunit_tmp_e, minunit_tmp_r);\
        minunit_status = 1;\
        return;\
    } else {\
        printf(".");\
    }\
)

#define mu_assert_double_eq(expected, result) MU__SAFE_BLOCK(\
    double minunit_tmp_e;\
    double minunit_tmp_r;\
    minunit_assert++;\
    minunit_tmp_e = (expected);\
    minunit_tmp_r = (result);\
    if (fabs(minunit_tmp_e-minunit_tmp_r) > MINUNIT_EPSILON) {\
        snprintf(minunit_last_message, MINUNIT_MESSAGE_LEN, "%s failed:\n\t%s:%d: %g expected but was %g", __func__, __FILE__, __LINE__, minunit_tmp_e, minunit_tmp_r);\
        minunit_status = 1;\
        return;\
    } else {\
        printf(".");\
    }\
)

/*
 * The following two functions were written by David Robert Nadeau
 * from http://NadeauSoftware.com/ and distributed under the
 * Creative Commons Attribution 3.0 Unported License
 */

/**
 * Returns the real time, in seconds, or -1.0 if an error occurred.
 *
 * Time is measured since an arbitrary and OS-dependent start time.
 * The returned real time is only useful for computing an elapsed time
 * between two calls to this function.
 */
static double mu_timer_real( )
{
#if defined(_WIN32)
    FILETIME tm;
    ULONGLONG t;
#if defined(NTDDI_WIN8) && NTDDI_VERSION >= NTDDI_WIN8
    /* Windows 8, Windows Server 2012 and later. ---------------- */
    GetSystemTimePreciseAsFileTime( &tm );
#else
    /* Windows 2000 and later. ---------------------------------- */
    GetSystemTimeAsFileTime( &tm );
#endif
    t = ((ULONGLONG)tm.dwHighDateTime << 32) | (ULONGLONG)tm.dwLowDateTime;
    return (double)t / 10000000.0;

#elif (defined(__hpux) || defined(hpux)) || ((defined(__sun__) || defined(__sun) || defined(sun)) && (defined(__SVR4) || defined(__svr4__)))
    /* HP-UX, Solaris. ------------------------------------------ */
    return (double)gethrtime( ) / 1000000000.0;

#elif defined(__MACH__) && defined(__APPLE__)
    /* OSX. ----------------------------------------------------- */
    static double timeConvert = 0.0;
    if ( timeConvert == 0.0 )
    {
        mach_timebase_info_data_t timeBase;
        (void)mach_timebase_info( &timeBase );
        timeConvert = (double)timeBase.numer /
            (double)timeBase.denom /
            1000000000.0;
    }
    return (double)mach_absolute_time( ) * timeConvert;

#elif defined(_POSIX_VERSION)
    /* POSIX. --------------------------------------------------- */
#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)
    {
        struct timespec ts;
#if defined(CLOCK_MONOTONIC_PRECISE)
        /* BSD. --------------------------------------------- */
        const clockid_t id = CLOCK_MONOTONIC_PRECISE;
#elif defined(CLOCK_MONOTONIC_RAW)
        /* Linux. ------------------------------------------- */
        const clockid_t id = CLOCK_MONOTONIC_RAW;
#elif defined(CLOCK_HIGHRES)
        /* Solaris. ----------------------------------------- */
        const clockid_t id = CLOCK_HIGHRES;
#elif defined(CLOCK_MONOTONIC)
        /* AIX, BSD, Linux, POSIX, Solaris. ----------------- */
        const clockid_t id = CLOCK_MONOTONIC;
#elif defined(CLOCK_REALTIME)
        /* AIX, BSD, HP-UX, Linux, POSIX. ------------------- */
        const clockid_t id = CLOCK_REALTIME;
#else
        const clockid_t id = (clockid_t)-1; /* Unknown. */
#endif /* CLOCK_* */
        if ( id != (clockid_t)-1 && clock_gettime( id, &ts ) != -1 )
            return (double)ts.tv_sec +
                (double)ts.tv_nsec / 1000000000.0;
        /* Fall thru. */
    }
#endif /* _POSIX_TIMERS */

    /* AIX, BSD, Cygwin, HP-UX, Linux, OSX, POSIX, Solaris. ----- */
    struct timeval tm;
    gettimeofday( &tm, NULL );
    return (double)tm.tv_sec + (double)tm.tv_usec / 1000000.0;
#else
    return -1.0;        /* Failed. */
#endif
}

/**
 * Returns the amount of CPU time used by the current process,
 * in seconds, or -1.0 if an error occurred.
 */
static double mu_timer_cpu( )
{
#if defined(_WIN32)
    /* Windows -------------------------------------------------- */
    FILETIME createTime;
    FILETIME exitTime;
    FILETIME kernelTime;
    FILETIME userTime;
    if ( GetProcessTimes( GetCurrentProcess( ),
        &createTime, &exitTime, &kernelTime, &userTime ) != -1 )
    {
        SYSTEMTIME userSystemTime;
        if ( FileTimeToSystemTime( &userTime, &userSystemTime ) != -1 )
            return (double)userSystemTime.wHour * 3600.0 +
                (double)userSystemTime.wMinute * 60.0 +
                (double)userSystemTime.wSecond +
                (double)userSystemTime.wMilliseconds / 1000.0;
    }

#elif defined(__unix__) || defined(__unix) || defined(unix) || (defined(__APPLE__) && defined(__MACH__))
    /* AIX, BSD, Cygwin, HP-UX, Linux, OSX, and Solaris --------- */

#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)
    /* Prefer high-res POSIX timers, when available. */
    {
        clockid_t id;
        struct timespec ts;
#if _POSIX_CPUTIME > 0
        /* Clock ids vary by OS.  Query the id, if possible. */
        if ( clock_getcpuclockid( 0, &id ) == -1 )
#endif
#if defined(CLOCK_PROCESS_CPUTIME_ID)
            /* Use known clock id for AIX, Linux, or Solaris. */
            id = CLOCK_PROCESS_CPUTIME_ID;
#elif defined(CLOCK_VIRTUAL)
            /* Use known clock id for BSD or HP-UX. */
            id = CLOCK_VIRTUAL;
#else
            id = (clockid_t)-1;
#endif
        if ( id != (clockid_t)-1 && clock_gettime( id, &ts ) != -1 )
            return (double)ts.tv_sec +
                (double)ts.tv_nsec / 1000000000.0;
    }
#endif

#if defined(RUSAGE_SELF)
    {
        struct rusage rusage;
        if ( getrusage( RUSAGE_SELF, &rusage ) != -1 )
            return (double)rusage.ru_utime.tv_sec +
                (double)rusage.ru_utime.tv_usec / 1000000.0;
    }
#endif

#if defined(_SC_CLK_TCK)
    {
        const double ticks = (double)sysconf( _SC_CLK_TCK );
        struct tms tms;
        if ( times( &tms ) != (clock_t)-1 )
            return (double)tms.tms_utime / ticks;
    }
#endif

#if defined(CLOCKS_PER_SEC)
    {
        clock_t cl = clock( );
        if ( cl != (clock_t)-1 )
            return (double)cl / (double)CLOCKS_PER_SEC;
    }
#endif

#endif

    return -1;      /* Failed. */
}

#ifdef __cplusplus
}
#endif

#endif /* __MINUNIT_H__ */
